Valdes served as President of the Senate of Chile, considered the second most important office in the country after the presidency, from 1990 to 1996.[2] He retired from the Senate in 2006.[2]
Gabriel Valdés died from bronchitis on September 7, 2011, at his home in Santiago, Chile, at the age of 92.[2] He had recently been admitted as a patient at Clínica Alemana for treatment of a long illness.[2]